Navalyze · General cargo · Ship

IOHANN MAHMASTAL

IMO: 8603406
Type: General cargo ship
Port of registry: Arkhangelsk
Technical efficiency: EIV 23.08 g CO₂/t·nm
Ice class: IA

Report year

2020 at a glance

From the 2020 THETIS-MRV report.

Fuel per mile

39.0 kg/nm

General cargo median 55.1 kg/nm (−29%)

CO₂ per transport work (dwt)

29.36

g CO₂/dwt·nm · General cargo median 24.50 (+20%)

Average speed

9.8 kn

General cargo median 10.7 kn (−8%)

Fuel per day at sea

9.2 t/day

Fuel consumed

187 t

CO₂ emitted

591 t

Distance sailed

4,804 nm

CO₂ ÷ CO₂ per mile

Time at sea

488 h

20 days, 6% of the year

Within the general cargo fleet, 2020

Set against all 1,167 general cargo ships with a full-year 2020 report. Bigger ships burn more per mile but less per tonne of cargo, so read fuel per mile with the ship's size in mind.

Fuel per mileThis ship 39.0 kg/nm · median 55.1 (−29%)

36.0Ranks 182 of 1,167, lowest first90.9

Average speedThis ship 9.8 kn · median 10.7 (−8%)

8.2Faster than 34% of general cargo ships12.9

CO₂ per transport work (dwt)This ship 29.36 g CO₂/dwt·nm · median 24.50 (+20%)

11.30Ranks 780 of 1,167, lowest first48.87

Middle 80% of shipsMiddle 50%General cargo medianThis ship

Where the emissions happen, 2020

THETIS splits each ship's CO₂ by voyage type. The split sets how much falls under the EU ETS: all of it within the EU and at berth, half of it on voyages into or out of the EU.

Between EU ports64%
From the EU19%
Into the EU13%
At berth in the EU4%

Fuel burned laden

–

Not reported

CO₂ at berth

3.9%

Alongside in EU ports

Methane (CH₄)

–

Mainly from LNG; small for oil

CO₂eq ÷ CO₂

–

Uplift from CH₄ and N₂O, counted in full from 2026

Over the years

Full-year reports only. The General cargo median is the middle ship of all general cargo ships reporting that year; it moves with the fleet, so a ship can gain on it without changing itself.

Fuel per mile, kg/nm

IOHANN MAHMASTAL
General cargo median

35.040.045.050.055.060.0

’182018’192019’202020

Average speed, kn

IOHANN MAHMASTAL
General cargo median

9.510.010.511.0

’182018’192019’202020

CO₂ per transport work (dwt), g CO₂/dwt·nm

IOHANN MAHMASTAL
General cargo median

20.030.040.050.060.0

’182018’192019’202020

Year on year

Year	Speed	Fuel per mile	Fuel per day	Distance	CO₂ per TW	Reading
2019→2020	+0.0 kn	−8%	−8%	−79%	−10%	Same speed, fuel per mile down 8%; better than speed alone explains (hull, engine or trade).
2018→2019	−1.0 kn	−8%	−17%	+318%	−36%	1.0 kn slower, fuel per mile down 8%; worse than speed alone explains (fouling, weather, loading or trade).

Fuel per mile rises roughly with the square of speed for a given ship, so a change in speed explains much of a change in fuel per mile.

Every reporting year

One row per THETIS-MRV report. A ship that changed operator during a year has a part-year report for each.

Operation

Year	ISM company	Fuel t	CO₂ t	Distance nm	At sea h	Speed kn	Fuel kg/nm	CO₂ g/t·nm	Laden fuel
2020	not published	187	591	4,804	488	9.8	39.0	–	–
2019	not published	955	3,014	22,475	2,301	9.8	42.5	–	–
2018	not published	249	779	5,381	496	10.8	46.3	50.59	–

Benchmark and verification

Year	ISM company	CO₂ per TW, g CO₂/dwt·nm	General cargo median	vs General cargo	Rank	Verifier	Methods
2020	not published	29.36	24.50	+20%	780 of 1,167	Verifavia	A
2019	not published	32.48	24.96	+30%	814 of 1,154	Verifavia	A
2018	not published	50.59	24.89	+103%	916 of 1,044	Verifavia	A

Fuel per mile and CO₂ per tonne-mile are the ship's own reported KPIs. General cargo ships are benchmarked on CO₂ per transport work (dwt) (TW), in g CO₂/dwt·nm. CO₂eq adds methane and nitrous oxide and is in the public files from 2024. Rank counts from the lowest figure among that year's general cargo ships. Methods: A delivery notes, B tank monitoring, C flow meters, D direct measurement. FuelEU GHG intensity is not shown: it needs fuel types, which the public file does not carry. Operators are named only from 2024, the first year the public files carry them; earlier years belong to the ship, not to any company.